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Planets
Planets change positions in the sky as they orbit around the Sun. To locate the plan-
ets on a given day or month, consult a monthly astronomy magazine, such as Sky and
Telescope or Astronomy. You can also consult Autostar II for information about plan-
ets
. Scroll to the "Object: Solar System" menu and scroll through the lists of planets.
When a planet you are interested in displays, press ENTER. Use the Scroll keys to
display information about the planet, such as the planet's coordinates, and the rise
and set times. Listed below are the best planets for viewing through the
RCX400.
Venus is about nine-tenths the diameter of Earth. As Venus orbits the Sun, observers
can see it go through phases (crescent, half, and full) much like those of the Moon.
The disk of
Venus appears white as Sunlight is reflected off the thick cloud cover that
completely obscures any surface detail.
Mars is about half the diameter of Earth, and appears through the telescope as a tiny
reddish-orange disk. It may be possible to see a hint of white at one of the planet’s
polar ice caps. Approximately every two years, when Mars is closest to Earth in its
orbit, additional detail and coloring on the planet's surface may be visible.
Jupiter is the largest planet in our solar system and is 11 times the diameter of Earth.
Jupiter (
Fig. 70) appears as a disk with dark lines stretching across the surface. These
lines are cloud bands in the atmosphere
. Four of Jupiter’s moons (Io, Europa,
Ganymede, and Callisto) can be seen as “star-like” points of light when using even the
lowest magnification. These moons orbit Jupiter so that the number of moons visible
on any given night changes as they circle around the giant planet.
Saturn is nine times the diameter of Earth and appears as a small, round disk with
rings extending out from either side (Fig. 71). In 1610, Galileo, the first person to
observe Saturn through a telescope, did not understand that what he was seeing
were rings. Instead, he believed that Saturn had “ears.” Saturn’s rings are composed
of billions of ice particles ranging in size from a speck of dust to the size of a house.
The major division in Saturn's rings, called the Cassini Division, is easily visible
through the
RCX400. Titan, the largest of Saturn’s moons can also be seen as a bright,
star-like object near the planet.
Deep-Sky Objects
Star charts can be used to locate constellations, individual stars and deep-sky
objects. Examples of just some of the deep-sky objects you'll be able to observe with
your
RCX400 are given below:
Stars are large gaseous objects that are self-illuminated by nuclear fusion in their
core. Because of their vast distances from our solar system, all stars appear as pin-
points of light, irrespective of the size of the telescope used.
Nebulae are vast interstellar clouds of gas and dust where stars are formed. Most
impressive of these is the Great Nebula in Orion (M42) (
Fig. 72), a diffuse nebula that
appears as a faint wispy gray cloud. M42 is 1600 light years from Earth.
Open Clusters are loose groupings of young stars, all recently formed from the same
diffuse nebula.The Pleiades is an open cluster 410 light years away (Fig. 73).Through
the RCX400, numerous stars are visible.
Constellations are large, imaginary patterns of stars believed by ancient civilizations
to be the celestial equivalent of objects, animals, people, or gods. These patterns are
too large to be seen through a telescope. To learn the constellations, start with an
easy grouping of stars, such as the Big Dipper in Ursa Major. Then, use a star chart
to explore across the sky.
Galaxies are large assemblies of stars, nebulae, and star clusters that are bound by
gravity. The most common shape is spiral (such as our own Milky Way), but galaxies
can also be elliptical, or even irregular blobs. The Andromeda Galaxy (M31) (Fig. 74)
is the closest spiral-type galaxy to our own. This galaxy appears fuzzy and cigar-
shaped.
It is 2.2 million light years away in the constellation Andromeda, located
betw
een the large
“W”
of Cassiopeia and the g
reat square of P
egasus
.
Fig. 73: The Pleiades is one of the
most beautiful open clusters.
Fig. 72: A favorite winter sight—the
great nebula in Orion.
Fig.
74:
The Andromeda Galaxy
, the
largest galaxy of our local group.
Tip:
Enter a date in the Date
menu and you can deter-
mine if a planet(s) will be
visible during the night of
the entered date by check-
ing its rise and set times.
- Instruction Manual 1
- Focusing the Telescope 2
- CONTENTS 3
- QUICK-START GUIDE 4
- Assemble Your Tripod 4
- STEP 6: P 5
- QUICK-START GUIDE {CONTINUED} 6
- Point, Focus and Observe 7
- TELESCOPE FEATURES 8
- RCX400: YOUR PERSONAL 10
- WINDOW TO THE UNIVERSE 10
- 1@) to the 12
- RCX400 TIPS 15
- GETTING STARTED 16
- Aligning the Viewfinder 18
- OBSERVING 19
- Terrestrial Observing 21
- Slew Speeds 21
- Observe the Moon 22
- Astronomical Observing 22
- Go To Saturn 24
- Using the Guided Tour 24
- The Global Positioning System 25
- Detecting True Level 25
- Finding True North 25
- RCX400 INFO 25
- BASIC AUTOSTAR II 26
- Example of Locating a menu 27
- Navigating Autostar II 27
- AUTOSTAR II's MENUS 28
- Object Menu 29
- Event Menu 30
- Glossary Menu 31
- Utilities Menu 31
- Setup Menu 32
- Look into the Future 32
- PARK POSITION (see above) 33
- PERIODIC ERROR COR 34
- Table 1: Time Zone Shift 35
- Calculations are for standard 35
- "Hot Button" Menus 36
- ADVANCED AUTOSTAR II FEATURES 37
- Creating User Objects 38
- Observing Satellites 39
- Landmarks 39
- Identify 40
- Alternate Alt/Az Alignments 42
- Initialize Autostar II 42
- Easy (Two-Star) Alignment 42
- Two-Star Alt/Az Alignment 42
- One-Star Alt/Az Alignment 43
- Periodic Error Correction 44
- PHOTOGRAPHY 45
- OPTIONAL ACCESSORIES 48
- Star Charts 50
- MAINTENANCE 51
- RCX400 models is performed 52
- Inspecting the Optics 53
- Meade Customer Service 53
- TELESCOPE SPECIFICATIONS 54
- AUTOSTAR II SPECIFICATIONS 56
- APPENDIX A: EQUATORIAL 57
- (POLAR) ALIGNMENT 57
- Equatorial Wedge 58
- Precise Polar Alignment 60
- APPENDIX B: LATITUDE CHART 62
- APPENDIX C: CREATE 63
- YOUR OWN GUIDED TOUR 63
- Further Study 67
- APPENDIX E: THE MOON MENU 68
- APPENDIX F: 69
- Smart Mount 69
- SMART MOUNT 70
- APPENDIX G: 71
- 16" RCX400 71
- Fifth bolt 73
- Connector 73
- BASIC ASTRONOMY 74
- MEADE LIMITED WARRANTY 76
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